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Tig is always done in straight polarity, i.e. electrode negative.
reason: almost 2/3rd of the heat is generated in positive terminal of weld, in this case the base metal and the rest in the negative terminal, in this case the tungsten electrode.
Also you don't want to deposit the tungsten electrode in the weld, do you?
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What is the difference between Tig weld vs plasma weld?
When we are using the tig welder we getting welding defects on our blanks, but when using the plasma weld no defects are found
What it the welder called that can weld aluminum?
can weld aluminium with a mig or tig welder
What polarity is used for mild steel GTAW?
The only way to tig is to have your ground clamp hooked to the positive side of the welding machine. The negative lead will go to the tig torch. If it is reversed you will find out very quickly when you strike an arc. Most metals will be welded using this Polarity (straight). Most Aluminum TIG welding is performed using A C current.
Where does silica come from when tig welding carbon steel?
Silicon is added to the tig rods in production. Use a gas weld rod which does not have the silicon and the weld will be full of porosity.
How do you weld sanitary stainless steel?
The three ways you would weld stainless steel are; 1. laser 2. friction 3. TIG Only TIG should be considered for nonproduction welding.
What are Miller TIG systems used for?
Miller TIG system are well used systems. The Miller TIG systems are used for welding, calculating the costs of welding and materials, and showing how to weld.
Why do they use argon gas to tig weld?
Argon gas is an inert gas and it shields the weld from any contamination from the out side air. It shields the weld and makes it cleaner and stronger.
TIG weld Testing Techniques How do you test TIG welding on a CuNi Pipe section?
One method is Ultra Sonic Sound, another Die Penetration.
What are the welder settings for tig welding?
On a basic machine connect the torch to the ground (-) and the ground cable to the positive (+). TIG uses DCSP (straight polarity). Turn on the gas (argon) and set at 15. Trial and error for the amperage setting. That's it. More elaborate machines have a polarity switch. Set this to straight polarity. If it has a high frequency switch set this to START. If it has a foot control it may have a remote setting. Use that. Also set the amperage knob to MAX. Crank open the argon cylinder and set the flow meter for 15 unless you are working in a breeze then set at 25 or so.
What are common solder and weld techniques used more than TIG?
mig, oxy-acetelene, arc,
Difference between tig and mig?
It depends on what you're welding and what kind of weld you need. For an extremely strong weld where you don't want to transfer as much heat to the surrounding areas, tig is the way to go. Tig has the option of melting only the source material (together), so if it is better than no material is added, then tig is the better process. If you want a small, uniform weld, then tig is also superior. Mig is wire-feed and so adds material to the pieces being welded. So it is better for filling areas or adding superior strength. If the material surrounding the weld can take the heat or doesn't matter if it is deformed or discolored, then mig welding is the way to go. A good discussion of Tig and Mig welding is here http://www.ridgecrest.ca.us/~biesiade/weld.htm.
How long should the taper on the tungsten be when tig welding?
Depends on how wide a weld deposit you want and how thick the metal is. Short blunt points distribute a wide arc and are used on thick materials. A fine point concentrates the heat and is used on thin metal. You will develope your own techniques. Aluminum welding usually employs pure tungsten and you would form a ball on the end by using reverse polarity and establishing an arc long enough to form a ball the size you want then changing to A C to weld.
